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不同浓度铵态氮对镉胁迫轮叶黑藻生长及抗氧化酶系统的影响
引用本文:许秋瑾,金相灿,王兴民,扈学文,陈书琴,颜昌宙.不同浓度铵态氮对镉胁迫轮叶黑藻生长及抗氧化酶系统的影响[J].应用生态学报,2007,18(2):420-424.
作者姓名:许秋瑾  金相灿  王兴民  扈学文  陈书琴  颜昌宙
作者单位:中国环境科学研究院湖泊生态环境创新基地,国家环境保护湖泊污染控制重点实验室,北京,100012
基金项目:国家重点基础研究发展计划(973计划);国家科技专项基金
摘    要:用含有不同浓度NH4+-N (0、0.5、2.0和4.0 mg·L-1)和10 mg·L-1Cd的1/10 Hoagland营养液培养沉水植物轮叶黑藻,研究了氨态氮对Cd胁迫下轮叶黑藻的生长及抗氧化酶系统的影响,探讨富营养化污染水体沉水植物退化机理.结果表明,10 mg·L-1Cd对轮叶黑藻能产生明显的胁迫作用,叶绿素合成量明显降低;超氧化物岐化酶(SOD)与过氧化物酶(POD)活性呈先升高后下降的趋势.NH4+-N能加速Cd对植物的胁迫作用,单因子Cd作用3 h时SOD明显升高,而Cd和NH4+-N共同作用0.5 h SOD就明显升高.Cd与NH4+-N共同作用时,相对于叶绿素和蛋白质,抗氧化酶是早期敏感指标,并且SOD比POD更敏感.本试验条件下,NH4+-N与Cd共同作用2 d后,对轮叶黑藻的胁迫作用主要取决于Cd,NH4+-N的作用几乎可以忽略.

关 键 词:黑藻  抗氧化酶
文章编号:1001-9332(2007)02-0420-05
收稿时间:2006-1-6
修稿时间:2006-01-06

Effects of different concentration ammonium-N on Hydrilla verticillata antioxidant enzymes under Cd stress
XU Qiu-jin,JIN Xiang-can,WANG Xing-min,HU Xue-wen,CHEN Shu-qin,YAN Chang-zhou.Effects of different concentration ammonium-N on Hydrilla verticillata antioxidant enzymes under Cd stress[J].Chinese Journal of Applied Ecology,2007,18(2):420-424.
Authors:XU Qiu-jin  JIN Xiang-can  WANG Xing-min  HU Xue-wen  CHEN Shu-qin  YAN Chang-zhou
Institution:State Environmental Protection Key Laboratory for Lake Pollution Control, Research Center of Lake Eco-environment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Abstract:In this paper, submersed plant Hydrilla verticillata was cultivated in a 1/10 Hoagland culture medium added with different concentration NH4 + -N (0, 0. 5, 2. 0, 4. 0 mg x L(-1)) and 10 mg x L(-1) cadmium to study the effects of NH4 + -N on H. verticillata growth and its antioxidant enzyme system under Cd stress, and approach the degradation mechanism of submersed macrophyte in eutrophic and polluted water bodies. The results showed that under 10 mg x L(-1) Cd stress, the chlorophyll content of H. verticillata decreased obviously, and SOD and POD activities increased first but declined then. NH4 + -N accelerated the stress effect of Cd. Under 0. 5 h joint stress of Cd and NH4 + -N, SOD activity increased significantly, while such an increase needed 3 hours under single Cd stress. Relative to chlorophyll and protein, antioxidant enzyme system was an early sensitive index, and SOD was more sensitive than POD. After two days exposure to Cd plus NH4 -N, H. verticillata was mainly stressed by Cd, and NH4+ -N stress could be neglected.
Keywords:NH4 -N  Cd
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